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Stock option activity (Details) {Stockholder Equity}
 6 Months Ended
Jun. 30, 2015
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Number of Options  
Stock option Outstanding 900,000
Stock option Exercisable 112,500
Stock option Forfeited (380,000)
Stock option Granted 480,000
Stock option Exercised 0
Stock optionOutstanding 1,000,000
Stock option Exercisable 272,500
Weighted Average Exercise Price  
Stock option Outstanding 1.00
Stock option Exercisable 1.00
Stock option Forfeited 0
Stock option Granted 1.60
Stock option Exercised 0
Stock optionOutstanding 1.16
Stock option Exercisable 1.02
Contractual Life in Years  
Stock option Outstanding 3.41
Stock option Exercisable 3.16
Stock option Forfeited 0
Stock option Granted 9.56
Stock option Exercised 0
Stock optionOutstanding 4.57
Stock option Exercisable 2.94
Intrinsic Value  
Stock option Outstanding 0
Stock option Exercisable 56,250
Stock option Forfeited 0
Stock option Granted 0
Stock option Exercised 0
Stock optionOutstanding 0
Stock option Exercisable 144,375